mid-ocean ridge-the longest chain of mountains in the world sonar-device that bounces sound waves off underwater objects and then records the echoes off these sound waves. Deep-Ocan trenches-deep underwater canyons Subduction-the process by which the ocean floor sinks beneath a deep-ocean trench and then back into the mantle.
Table of Contents
1.4 Sea-Floor Spreading Notes
Vocabulary
mid-ocean ridge-the longest chain of mountains in the worldsonar-device that bounces sound waves off underwater objects and then records the echoes off these sound waves.
Deep-Ocan trenches-deep underwater canyons
Subduction-the process by which the ocean floor sinks beneath a deep-ocean trench and then back into the mantle.
Outline
Mapping the mid-Ocean ridge
Evidence from sea-floor spreading
Subduction at Deep-Ocean Trenches
Subduction and Earth's Oceans